18-Bit,100 kSPS PulSAR A/D Converter

The AD7678 is an 18-bit, 100 kSPS, charge redistribution SAR, fully differential analog-to-digital converter that operates on a single 5 V power supply. The part contains a high speed 18-bit sampling ADC, an internal conversion clock, an internal reference buffer, error correction circuits, and both serial and parallel system interface ports.

The part is available in 48-lead LQFP or 48-lead LFCSP packages with operation specified from –40°C to +85°C.

* 18-bit resolution with no missing codes

* No pipeline delay (SAR architecture)

* Differential input range: ±VREF (VREF up to 5 V)

* Throughput: 100 kSPS

* INL: ±2.5 LSB max (±9.5 ppm of full scale)

* Dynamic range: 103 dB typ (VREF = 5 V)

* S/(N+D): 100 dB typ @ 2 kHz (VREF = 5 V)

* Parallel (18-,16-, or 8-bit bus) and serial 5 V/3 V interface

* SPI®/QSPI™/MICROWIRE™/DSP compatible

* On-board reference buffer

* Single 5 V supply operation

* Power dissipation: 18 mW @ 100 kSPS, 180 μW @ 1 kSPS

* 48-lead LQFP or 48-lead LFCSP package

* Pin-to-pin compatible upgrade of AD7674/AD7676/AD7679